含Zr高强铝合金的细晶技术与性能调控新方法  

New Controlling Strategy on Grain Refinement Technique and Behavior of High Strength Aluminum Alloy Containing Zr

作　　者：赵凯 刘桂亮 孙谦谦[1,2] 刘相法 ZHAO Kai;LIU Guiliang;SUN Qianqian;LIU Xiangfa(Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials,Ministry of Education,Shandong University,Jinan 250061;Shandong Al&Mg Melt Technology Co.,Ltd.,Jinan 250061)

机构地区：[1]山东大学材料液固结构演变与加工教育部重点实验室,济南250061 [2]山东吕美熔体技术有限公司,济南250061

出　　处：《特种铸造及有色合金》2024年第12期1610-1615,共6页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(52071189);山东省重点研发计划(重大科技创新工程)资助项目(2023CXGC01030)。

摘　　要：7050高强铝合金因其优异的力学性能被广泛应用于航空、航天结构件材料。然而,合金化程度高、结晶温度范围宽导致该合金铸造性能差。使用Al-Ti-B、Al-Ti-C等细化7050合金时,易发生Zr致细化剂“中毒”现象。因此,将一种富含微纳尺度掺杂型粒子的Al-TCB新型细化剂引入7050合金中,研究了其对7050合金凝固组织、铸造性能及力学性能的影响。结果表明,熔体中添加AlTCB晶种合金后,7050合金晶粒显著细化,熔体流动性提高,热裂倾向降低。指出了高效晶粒细化是抑制7050合金铸造缺陷和同步提升合金强韧性的关键,提出了含Zr高强铝合金的细晶技术与性能调控新方法。7050 alloy has been widely used in aerospace and transportation fields due to the excellent mechanical properties.However,the high alloying degree and wide crystallization temperature range lead to the poor castability.Moreover,the Zr-poisoning phenomenon easily occurs when the conventional grain refiners are applied,such as Al-Ti-B and Al-Ti-C master alloys.A novel Al-TCB refiner was introduced into 7050 alloy,which was rich in micro-and nano-scale doped particles,and effects on the solidification microstructure,castability and tensile properties of 7050 alloy were investigated.The results indicate thatα-Al grains are refined significantly after Al-TCB seed alloy addition,and the fluidity is improved along with reduction of hot cracking tendency.The fact that key point of inhibiting casting defects and improving strength and toughness for 7050 alloy is efficient grain refinement was presented.A new controlling strategy on grain refinement technique and property of high strength aluminum alloy containing Zr was proposed.

关 键 词：Al-TCB晶种合金 7050合金 晶粒细化 铸造性能 强韧化 

分 类 号：TG292[金属学及工艺—铸造] TG146.21[一般工业技术—材料科学与工程]